SOLUTION: Sorry if this isn't the right topic.... this is from an accuplacer practice test. I know the answer is 11z-20 over z(z-5) but don't understand how to work it. Here's the problem:

Question 302035: Sorry if this isn't the right topic.... this is from an accuplacer practice test. I know the answer is 11z-20 over z(z-5) but don't understand how to work it. Here's the problem: 4/z plus 7/z-5
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
4/z plus 7/z-5
-------------------------
least common denominator: z(z-5)
-------
Rewrite each fraction with the lcd as its denominator:
(4(z-5))/lcd + (7z)/lcd
----
Combine the numerators over the lcd:
[4z-20+7z)/lcd
---
Simplify:
(11z-20)/[z(z-5)]
========================
Cheers,
Stan H.
========================
RELATED QUESTIONS
Sorry if this isn't the right topic.... this is from an accuplacer practice test. I know (answered by london maths tutor)

Solve the inequality and represent your answer in set builder notation. Show all work. (answered by solver91311)

There is a question on the practice Compass test I don't understand. It is; For all... (answered by MathLover1)

What is the answer to this equation 11z+2c=63 for z? (answered by jim_thompson5910)

solve for z: e^2z-1 = 3 sorry i dont really know what topic this is. im just trying to... (answered by jim_thompson5910)

Could you please tell me if I have the right answer and if not show me what I am doing... (answered by edjones)

I think I am in the right section. I'm doing practice problems but I don't have an answer (answered by 303795)

Divide and if possible simplify: (5p-5/p)/(6p-6/5p^2) I know that i have to flip the... (answered by ankor@dixie-net.com)

Subtract, Simplify if possible. I have tried this problem but I am not sure if this is (answered by stanbon)